Heat-insulating compound.



5. COMPOSITIONS, amma- UNITED STATES PATENT OFFICE.

NAKABA ITO, OF TOKYO FU, JAPAN.

HEAT-INSULATING COMPOUN'D.

1,245,723 Specification of Letters Patent. Patented Nov, 6, 1917 NoDrawing. Application filed July 14. 1917. Serial No. 180,602.

To all whom it may concern: centage of calcium hydrate may be admittedBe it known that I, NAKABA I'ro, subject into the compoun of Japan,residing at No. 768, Ikebukuro, In this invention the principal heat-in-55 Sugamo Mura, Kita Toshima Gun, Tokyo sulating material is thekieselguhr, while Fu, Japan, have invented new and useful the asbestosprincipally serves as binding Improvements in Heat-Insulating Commedium.The calcium bicarbonate, before pounds, of which the following is aspecificathe mass completely solidifies and while the, tion. moisture isevaporating, decomposes and 1 0 This invention relates to a heatinsulating evolves carbon dioxid slowly which causes 10 compound whichis manufactured by adding innumerable pores to form in the mass. The toa mixture of kieselguhr, fibrous asbestos, sodium bicarbonate preventsthe decomposicarbonate of magnesium, and calcium sultion of the calciumbicarbonate taking place fate an aqueous solution of a bicarbonatebefore kneading. At the same time it willbe 65 salt, and kneading andallowing the mixture decomposed by the liquid sodium sulfate and tosolidify. The object of this invention is evolve carbon dioxid, and alsoproduce to obtain a substance which is porous and sodium sulfate, asshown in the following light, and is an efficient non-conductor offormula. This sodium sulfate promoting the heat. solubility of calciumsulfate, a suitable 70 When kieselguhr, asbestos, and the like quantitythereof is constantly dissolved in are solidified by mixing the samewith anwater and evolves carbon dioxid thus makhydroui calcium sulfate,the dsubstance obing the SHW porous:- tained ecomes a compact an heavymass, 1 and consequently the heat insulating propgd6 +Na S0 +00 m 75erty of the kieselguhr, asbestos and other in- 3 2 4 aafihgredients isgreatly impaired. My invention In summing up, the main feature of thisis an improvement on such substance, and Invention is mixture ofkieselguhr and consists in adding to the above ingredients fibroussubstance such as asbestos with a a bicarbonate salt, and kneading themixture bicarbonate salt and calcium sulfate; for so carefully, thuscausing the bicarbonate salt I 1. If fibrous substance is wanting, theto mix evenly with the other ingredients. mass when kneaded by addingwater there- Then the bicarbonate salt will be decomto, will become avery soft paste, and a great posed by the calcium sulfate and evolvecardifficulty will be experienced in applying it bon dioxid very slowlywhile the mixture is to boilers, pipes and the like. Moreover, it 85solidifying. and thus a porous substance will has propensity to becomebrittle when be obtained. solidified.

The following is an example of carrying 2. The bicarbonate salt andcalcium sulmy invention into eifect: fate act to generate carbon dioxidvery First form calcium carbonate by passing slowly Which makesthey-substance very 90, carbon dioxid into a solution of calcium porous.Moreover, the calcium sulfate prehydrate, and then turn it into solublecalvents the substance from becoming soft cium bicarbonate. To- 100parts of this sopaste, and at the same time removes the fear lution ofcalcium bicarbonate add from I to of the substance becoming cracked whenpar s 0 so 111m icar onate. Add the solidified or of leaving, whenapplied to 95 fluid thus prepare 0 a mix ure of 50 parts boilers, pipesand the like, vacant spaces beof kiesel uhr 20 parts of fibrous asbestostween their surfaces and the coating.

embonate of ma esium and ill The substance of my invention is porousparts of anhvdrous calcium sulfate and and light, and is an efficientheat insulator. carefully knead the whole. The paste thus It is,therefore, a fit substance to be used 100 formed may be solidified in amold into any with boilers, steam pipes, brine pipes of rerequiredshape, or may be applied directly frigerators and the like to preventradiation to boilers, steam-pipes, or the like to form of heat or itsintroduction into them. heat-insulating layer thereon. A small per-Having thus described my invention, what I claim and desire to beprotected by Letters Patent is 1. A heat-insulating substancecharacterized by the addition of calcium sulfate and a bicarbonate saltto a mixture of kieselguhr and fibrous substance, for the purposehereinbefore set forth.

2. A heat-insulating substance manufactured by addition of an aqueoussolution of calcium bicarbonate and sodium bicarbonate to a mixture ofkieselguhr, asbestos, carbonate of magnesium and calcium sulfate, forthe purposes hereinbefore set forth.

In testimony whereof I have signed my name to this specification in thepresence of 15 two subscribing witnesses.

' NAKABA ITO.

Witnesses:

YOSHIKA IKEDA, K. ITo.

Copies of this patent may be obtained for five cents each, by addressingthe "Commissioner of Patents. I

Washington, D. 0. 4

